Filter



/ Au 7,1928? v 1,680,029

E. J. SWEETLAND FILTER Filed Jan. 10 1922 isne ts-sheet 2 A TTOR/VEYS Patented Aiig. 7, 1928;

b n arvns'r a. swear i 1 I 'App1lcatlen illed loft.

.Among the objects or my invention are to provide anew that mightbe removed rom the filter leaves andflwhich acts as a settling chamber for;'

water which mightfind its way into the oil eitherdue to condensa; the waterjackets, andcirculatory system,- tion or leakage from which chamber also trapsa certain amount:

' provide means .15

of impurities b sedimentation.

for cleaning the jfsettling *A' furtherxoject f. the invention is, to

chamber or 'compartmenfl'in a convenient tacle for'the'solids 7,

howing a section of one of thefilter leaves It's. 538,3. f

stalledbn-itheinternal' conibustion engine of &'\%BhiOl Q,-=

igure 6 'is afview showmg' amodifi d form of installation, and e Figure 7 is a detail view'on a larger scale mounted on the filter leaf shaft. :,S 1m1lar' characters of reference designate imilar artsm'each of the several views, I

The ter; isindicated. by the reference characterF and comprises a casing 1 whichf is preferably of cast iron or aluminum,hav-.-i J

ing- 'such 'shape as "to. provide a cylindrical upper port on for receiving the filter elements15, and a substantially triangular low-v :er portion or settling chamber as indicated.

object'of the invention-ism pro 'zin Fig re '2- Th fro of the c ing is pr vrded with a circular opening'which is covered byaplate2. having alip 3 for cooperatgwith a circular groove 5 about the openmg. A; gasket 4 is provided in the oove to render the junction tight. A num r of -Another vide readily operable meansffor removing I the carbon laden slimeffrom't he surfaces of 5 each of the filter-elements, so that the same. will bedischargedby gravityinto the settling chambenirom whence it is removed by the automotive engine ceases to operate, thus i had. Several s thereof being i t the the afore-mentioned removing means.

" f Another novel feature oftheinvention're sides in the arrangement or the oil inlet to the filter casing and theoil outlet therefrom,

the associated passageways. being so ,ar-

ranged that when the filter is mountedat a point above the oil *levelin the crank case, filtration will be continued by gravity after "increasing the capacity of the filter. I still further ob ect of the invention is to provide means'for readily ,admitting'tothe casing a; filter: dressing: with which thefilter-elements will become coated as soon as the filter begins to function.

Other ob'ects of the invention will mani fest themse ves upon" a readin' of the i01 lowing specification'from whic a good-un--z the invention may now; be I ecific forms of embodiment derstanding of lustrated in the accompany? irig drawings, to. which reference is directedandinwhich'qfl- Figure is a view showing one form of a embodiment of thefilter invertical section, lane of the section being indicated by; E surface of this 'flannel'is'very advantageo re 1, taken on g nc 1-1 in Fi re 4;; Figure 2 is a sect onof. F1

- liries.-.IIII looking in the irection of the.

" arrows;

v Figure 3 is a view showing one of the filter elements in elevation;

Figure 4 is a front I Figure 5 elevation of the filter;

is a view showingthe filter innuts 6 (Figure 4;) too rate'with studs 7 in casing 1,.for securing e cover von the casing. At the up r e e of the casing there 1s provided a p ug 8 w 1011 may be removed for fillin the casing with aliquid, herein termed f a. fi ter dressing and at the lower art of the casing .is'provid'ed a plug9 whic may be used [for draining the casing or removing accumulated pr'eci itate' or water therefrom. A shaft '10,.provi ed with a disc 11 is. fixed to the inner end of the plug to facilitate the cleansingf --LThe fi ter leaves or elements 15 are mount; ed on, adrainage shaft 18, the exterior surface of which 1s square in cross section, as indicated in Figure 2.. The leaves15 each composed of a coarse mesh-wire draina e 'screen GO which is covered with any suit a le filter fabric 61. either metallic such as fine wire gauze or: it

may lichen-metallic. suchas cotton, linen, Y

woolens, silk'o'r asbestos cloth. ,In thepres me ,ent form of the filte'rl prefer the use of 'a fabric may b ef,

3e 7 packings unused for a considerable period of time.

Metallic plates 62 are provided at the center 'of screen 60, the

, on the shaft, so that a restriction in the flow of the filtered oil throughthe central opening is avoided.

The filter elements are spaced on the shaft by a series of spacing washers 27 (Figure Each face of the shaft is provided with i a groove 24 for conducting the filtered oil ments by means of rings w from the central openings ofthe filter leaves, to a seriesof holes 23, through which it passes to the circular draina e opening 21 in the shaft; A- plurality 0E are mounted between the adigcent filter ele- 'ch loosely en circle the spacing washers 27. The manner,

. in which these scrapers are operated will be posed of a rings 47 an of cleaning 1 described."

described hereinafter.

The rear end of the shaft is provided with a screw 25 which cooperates with a washer 26 for holding the filter elements in place. The forward end of the shaft is rounded to permit it to rotate within a stufiing box com- 48, which are held in spaced relationby a perforated metallic spacing ring 49. A plurality of holes 51 are provided in the shaft for permitting the filtered oil to escape from the interior of the shaft, and the perforated spacing ring together with the packing gland serves to keep both filtered and unfiltered oil is prevented. The

outer end 19 of the shaft is squared to permit of the application of-a'crank or wrench for turning the shaft durin the operation the filter, as wi hereinafter be i- The cover plate is lcast withan integral boss extending verticallyacross the-plate.

The upper against a cork gasket 29 'at its lower extremity,

30 is provided with a screw driver slot 32 anda passageway 33 which communicates with the interior of the filter casing by means of the passageways 34 and 35. The passageway 33. is of a restricted nature and applies resistance to the oil as it is fed to t e filter, thus maintaining a pressure on the feedline and possibly, in some cases, preventing the excess oil being fed thereto,

a which might interfere with the proper feedypressure when the leaves are assem-' scrapers 28 (packing gland 46 and packing pulverized kieselgu tight so that leakage of both the portion of this boss is bored out 1 "to recelve the' gage glass 28 which restsand is held in place at its upper end" by the nut 30 and cork gasket 31. The nut casing, where it is free to circulate between the filter leaves. I

The outlet for the filtered oil comprises the openings 51 in the drainage shaft, the nozzle 38 and the gage glass 39, this age glass being held between packing was ers 40 and 41, all of these parts being secured in place by the nut 42, having asquare central opening to facilitate removal. An outlet opening 43 is provided in the side of the boss and an outlet pipe 44 is in threaded connection with this opening. A sample cook 45 is screwed into the lowermost end of the boss for convenience in taking samples of the filtered oil.

For the purpose of-heating the oil wh ch is to be filtered, there is provided on casing 1 a jacket 12 having inlet and outlet pipes l3 and 14, which are connected with the exhaust gas or hot water system of the engine with which the filter is associated.

The inlet pipe 50 of the filter is constantly supplied'with turbid lubricating oil under pressure and the outlet pipe 44 leads to a reservoir in the oiling system of the engine, as is described more part:cularly hereinbelow.

The method of operation of the filter is l as follows: The filter casi is first filled with the filter dressing herein efore referred to, this dressing consisting preferably of hr mixed with oilin any fpreferably about 50 esired proportion oil.

grammes per quart o thoroughly rubbed together to eliminate all lumps and make a smooth flowing mixture. This dressing is introduced into the filter casing through the opening provided by the plug 8. The oil which is to be filtered is then caused to pass through pipe 50 into the casing, a pressure of from 5 lbs. to 10 lbs. er square inch being maintained on the eed 'hne, as will be described hereinafter. The clear oil mixed with the kieselguhr is thus displaced bysthe turbid crankcase oil and caused to filter through the leaves into shaft 18, passing from this shaft through sight glass 39 to the outlet pipe 44. The kieselguhr mixed with the oil is deposited during this process as a'thin, even layer on the surface of the filter cloth 61, thus con- :stituting a supplementary filter bed of ex- After the dressin has thus v Although in the present instance this bed is described as being composed of kieselguhr,

it will be understood that other powdered and preferably fiocculent substances may be employed, such substances being, for example fullers earth, pulverized charcoal,

This mixture is 1 dency to become slightly acid and therepipe 50 is stopped.

I; the filter surface so filtration gradually increases until after a fore, corrosive, an alkaline substance, such as hydrate, oxide or carbonate of lime may be incorporated inthe supplementary filter bed for the purpose of neutralizing the acidity of the oil.

As the filtration of the oil continues, a slime bed of finely divided carbon, 'road dust and other foreign matter is accumulated on that the resistance to period of time, say several months, theirate of flow through the filter elements is greatly reduced. The filter may then be cleaned in the following manner: The feed of oil through The drain plug 9 is then removed and the contents of the casing is allowed to drain into any convenient receptacle. A crank is now applied to the square end 19 of the filter shaft and the same is turned through, say, 12 or 15 revolutions. The scrapers 28 rotate with the filter elements through a small angle when their further rotation is stopped by lugs 54: (Figure 2) provided inthe wall of the casing. The continued rotation of the leaves causes the scrapers to disengage the bed of kieselguhr and slime deposited on their outer surfaces and causes this deposit to fall into the space below the filter elements. This space may be thoroughly cleaned out by the use of the scraping disc 11. After the filter has thus been thoroughly cleaned the casing is again filled with dressing through plug 8 so that a new filter bed of kieselguhr is deposited on the filter leaves. The operation of the filter may then be continued until a renewed cleansing is found necessary.

One of the important advantages of the present construction of the filter lies in the fact that, because of the two sight glasses, the turbid crank case oil may be observed at any time entering the filter and the clear oil leaving the filter, so that the operation thereof may be discerned at a glance. Another advantage consists in the provision of the settling chamber below the filter element, in which chamber the heavier solid particles as well as any water which may be in the oil will accumulate. Moreover,

because of the vertical position of the filter elements, the solids which are deposited thereon, will settle into the settling chamber at such time as when the filter is not in operation. The filter surfaces are thus relieved to a certain extent of carrying an excessive load of slime so that a rapid impairment of the filtering efficiency is avoided. The shaft of the filter may advantageously be given a turn or two from time to time so that the heavier impurities are removed without necessitating a thorough cleansing operation. The settling space below the filter elements thus constitutes a valuable storage chamber for the water and the accumulated solids where they remain out of harm to the engine and from which they may be removed when a thorough cleansing is to be effected.

The particular manner in which thefilter is preferably connected with the oil circulating system of an internal combustion engine is illustrated in Figure 5, in which the filter F is shown mounted on the dash board of an automobile, the face of the instrument being forward so that the sight glasses may conveniently be inspected by the operator. A pump which may be of any suitable type, is mounted upon the engine casing and is provided with an intake pipe 71 and outflow pipes 72 and 73. The intake pipe ex tends to the lowermost portion of the crank case of the engine and the outflow pipe 72 communicates with suitable ducts for leading the oil to the hearings or any other parts of the engine lubrication of which is desired. It will be understood that this portion of the drawing is merely diagrammatic and serves only to illustrate the ordinary systems of force feed or splash lubrication of the engine parts. The pipe 73 is joined to the outflow pipe 72 and communicates with the intake pipe 50 of the filter. The outflow pipe 44; of the filter leads to the interior of the crank case. By virtue of the above connection, the oil pump 70 is continually forcing a part of the circulating oil to the filter,

the remaining portion being directly re' turned to the bearings through pipe 7 2. As long as the engine is in operation, therefore, a continuous fiow of oil through the filter is maintained and continuous cleansing of the oil is thus secured.

A. relief valve 7 4 is provided on the inlet pipe of the filter. This valve communicates directly with the crankcase through a pipe 7 5. In the particular form of construction illustrated, it consists of a ball valve 76 normally maintained in closed position by a spring, the tension of which may be regu lated by an adjustable member 77. The tension is such that the oil flowing into the filter will be under a working pressure not greater than a maximum sufiicient to lubricate the engine parts and to overcome the back pressure ofiered to the fiow of oil by the filter. Should the pressure rise above this maximum, due to any clogging in the oil circulating system or to the fact that the pump delivers more oil than can flow through the system,'the ball valve will be forced from its seat, thus permitting some of the oil to by-pass the filter and flow directly into the crank case through the pipe 75. When the pressure returns to normal the spring returns the ball valve to its seat.

0 even though thesame' is inen emulsified conwhen removed will settle" in the settling-chamber below 1 the filter ele r vyithdrawvn vvhen this.

modification 7 is.shown-:a-pplied direotly to theisideo of the with a depressionthe bottomlof'the crank. case. Injthis modificatiomgtheoil pump is not" ""10 -filter, 1s connected directly the interior o the'crank case. 1

:ditiojn: such water ments' .:a nd. can

, chamberj is cleaned2-"- I matter that f vfact, a filter constitnctedin the manne'r' just described, has shown-gsatisfaetory results;

after hundreds of miles or runningwithout "the filter having factory filter limitmy" invention nnit disposed int mg, said-casing being prov ded with a set- -v means connected a partlofgvjtheregular sir-stem of theengine, t e

"circulating oil.

1? .ticles of, fcarbonl and. asphaltic sediment but falsoQseparate and removeany-water tha t mightube:entrained in] hancirculating oil v found that'it Y which iscapabIe ofarresting the very miin 'ail 'a of they filter surface; the filter device "offmy con-" t is, of 'eoursaixunderstood' that les may be 1 invfli i if 1. A'filter' amperagetirin a filter enpper tling chamber below sa'd lnits .for receiving the heavier impuri ;in the lower portion of said chamber and -b with said drain. plug to, ,f acilitate removal of said impurities when isagd drain plug is removed. 7 i

p n a filter, a casing, rotatablymounted in said casing, a plurality of the method Qf'mou'nting'. the filte'rjis illustratedinFigure 6; whereit wafil t er fabrieof engine',-,theinletpipe 50 being indirect; fflconnection zwith the 'outflow pipe'iot an-oil j pum'pZS,the-intake of which communicates I :but serves solely -for-I; purpose of supplying the filter with oil under pressure. The outlet; pipei ii of the Asheretofore observed; filter surfacesv v "-of:theifi1ter elements areofsuch fineness- -that'they notgonly intercept'the minute parnely woven'I non-metallic "fabric of such amextensive; area within a'sm'alI compass make'sfa very sat'isjf for th'ecpurpose'and I havej fmeanssupported'by serves 'toiproduceia filter bed.

said shaft; im'eans '5.- In a filter; a c'asin'gf having in 'on'eiface thereof; a La drainageshaft rotatably; mounted in, said cover, aplurality; of-

"chamber at -the to. the specific embodi ments shown-but that I intend to cover the. samegbroadly in' wha g settling chambert. tever "formf its prlnart of said eas-Q- h ft ties, a drain' plug provided" f drainage member,

said leaf having acentral drainage opening,

and a plate disposed bek finer mesh enveloping'said tween said fabric and said-drainage member adjacent said central opening for preventing .isaid fabric from entering said member and obstructing the flow of liquid in the leaf t ward; said central-opening;

ter comprising a casing, a drainage shaft rotatably mounted t here'in,-;a plurality of 'filter elements mounted OIiQSaid shaft,

spacing membershetween said elements, a

plurality; of scrapers; suspended loosely from said shaft'between'said elements, and means; for" preventing rotation-- of said scrapers vin unison with "said elements so' as to ybring 5 1 r e m ment. between said scrapers and the shaft; a

4.111 a filter, a' .ca sing 'having 'a .111 the face thereof; a drainage shaft a l f upon rotation' of a cover for, said saF le y 0 the purpose of' cl,ean

n i ifil t r' e em .cover for said 0 wing,-

filterelements mounted said shaft'to serape th'e n opening e openings, rotatably mounted on said g;"eover, said-shaftjbeing' normally stationary;

ter elements inomfntd'; on]: '1 for rotating said 'shaft'fo r u i m shaft isro'tated and means for'rotjating said- -nute and finely divided particlesyofsolid 'h it I are {present in the i1sed'-,oil.=-" l Owing toitheextensivcness' struetion'functio'hs for a considerable period of time without necessitating cleaning. :In,

an opening I inspaced relaton-"onj'sa id shaft, a settling Shaft and said shaft direction,. purities removed 1 by said-scrapers into said means to stop said scrapers, when and elements are rotated in either opening in the face.,thereof,' a coverfor said opening; rotatably mounted on said a drainage shaft cover said shaft being normally stationar aplurahty of filter elements inountedon sax f a 7 scrape the. impurities from said or rotating said impurities are'store ements bottom-:Qfsaid casing, aplu-. rality of scrapers between said e illoosely .and., rotatably suspended, from said in position to di ch the 'im 1 r WERNEST Ji .S ETLAND. f 

